Roget's Thesaurus: Entry 314 (Reciprocating motion, motion to and fro)

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#314. [Reciprocating motion, motion to and fro.] Oscillation. -- N. oscillation; vibration, libration; motion of a pendulum; nutation; undulation; pulsation; pulse.

alternation; coming and going &c. v.; ebb and flow, flux and reflux, ups and down.

fluctuation; vacillation &c. (irresolution) 605.

wave, vibratiuncle[obs], swing, beat, shake, wag, seesaw, dance, lurch, dodge; logan[obs], loggan[obs], rocking-stone, vibroscope[obs].

V. oscillate; vibrate, librate[obs]; alternate, undulate, wave; rock, swing; pulsate, beat; wag, waggle; nod, bob, courtesy, curtsy; tick; play; wamble[obs], wabble[obs]; dangle, swag.

fluctuate, dance, curvet, reel, quake; quiver, quaver; shake, flicker; wriggle; roll, toss, pitch; flounder, stagger, totter; move up and down, bob up and down &c. Adv.; pass and repass, ebb and flow, come and go; vacillate &c. 605; teeter [U.S.].

brandish, shake, flourish.

Adj. oscillating &c. v.; oscillatory, undulatory, pulsatory[obs], libratory, rectilinear; vibratory, vibratile[obs]; pendulous.

Adv. to and fro, up and down, backwards and forwards, hither and yon, seesaw, zigzag, wibble-wabble[obs], in and out, from side to side, like buckets in a well.